text: The coercivity of iron-cobalt metal particle mix, precipitated from aqueous solutions, depends on the cobalt content. A change in cobalt content from 0% to 30% causes a gradual rise in coercivity from around  (Type I level) to  (Type IV level); alloyed iron-cobalt particles can reach a coercivity of . This makes possible manufacturing of metal particle tapes conforming to Type II and even Type I biasing requirements.
  In practice, only Denon, Taiyo Yuden, and, for only a few years, TDK, ever attempted making Type II metal tape. These rare expensive cassettes were characterized by high remanence, approaching that of Type IV tapes (); their coercivity of  was closer to Type II than Type IV tapes, but still quite far from either type reference. Independent tests of the 1990 Denon and Taiyo Yuden tapes placed them at the very top of the Type II spectrum — if the recording deck could cope with unusually high sensitivity and provide unusually high bias current.